Re: [BUG] Softlockup detected with linux-2.6.14-rt6

[Daniel Walker]

Wasn't this thread related to a real lock up? I thought Luca said that 
the stack trace came from his printer.

I thought it might be related to the __delay troubles ..

Daniel

On Tue, 15 Nov 2005, Ingo Molnar wrote:

> * john cooper <john.cooper@xxxxxxxxxxx> wrote:
>
> > Ingo Molnar wrote:
> > > * Luca Falavigna <dktrkranz@xxxxxxxxx> wrote:
> > > > I found this softlockup bug involving arts daemon using a
> > > > linux-2.6.14-rt6 kernel (with "Complete Preemption" and "Detect Soft
> > > > Lockups" compiled in).
> > > > This bug does not happen everytime: I was able to reproduce it only
> > > > three times in a week. [...]
> > >
> > >
> > > does this happen with -rt13 too? I have fixed a softlockup
> > > false-positive in it.
> >
> > Just curious what the cause of the false positive was?
>
> the fix is below - we didnt reset the 'light' counter in the else
> branch.
>
> 	Ingo
>
> Index: linux/kernel/softlockup.c
> ===================================================================
> --- linux.orig/kernel/softlockup.c
> +++ linux/kernel/softlockup.c
> @@ -90,7 +90,8 @@ void softlockup_tick(void)
>
> 		wake_up_process(per_cpu(watchdog_task, this_cpu));
> 		per_cpu(timeout, this_cpu) = jiffies + msecs_to_jiffies(1000);
> -	}
> +	} else
> +		touch_light_softlockup_watchdog();
>
> 	if (per_cpu(print_timestamp, this_cpu) == timestamp)
> 		return;
> -
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